Back in the Day ,, the best Ciba labs that I knew of did something similar.
Basically 8x10 dupe trans were composed with complicated masking and colour masks and curve shapes were applied to the original trans.
the 8x10 dupe was then considered the new original and beautiful prints were made for these second generation dupes.
As John points out the next generation were indeed using the LVT's and I would not be suprised if Jeff Wall does his work that way.
Now Lambda is the exposing unit of choice for Elevator, Led does not work so it must come from the stronger Laser devices like the Lambda and Light jet.
I do not even consider enlarger printing onto cibachrome as it is pointless considering the control of CS3 and the lambda unit... light years ahead of putting a trans in the enlarger and trying to compromise contrast and colour saturation with each and every other trans.
Those who poo poo this have never tried both ways.
FWIW I was one of those who in the 80's made those complicated dupes, basically it was an all day task, just to make the masks and apply them to the original. We worked under incredibly controlled conditions and tolerences and by the 90's with digital and Iris prints , client would not pay big bucks for this complicated wizardry and ciba started its downfall due to a comprimize in quality and a major lack in Marketing by the Europeans who manufactured the material.
With the advant of Lambdas and sophisticated PS workflow the ability to print directly onto the material became apparent.. Unfortunately most commercial labs dumped there Ciba lines and switched to inkjet.
There were those like myself who kept the process alive as long as we could with enlarger printing,continually seeing a demise.
In 2002 I decided to basically put my balls on the line and those of my partner and Elevator took the big jump in investing in a Lambda unit.
Now we can print easily onto this material with great control, the material is very expensive and the demand is slowly growing back so we only print in spurts , maximise the chemicals and paper to the amount of work demanded. Once all the prints are done the chems are dumped and the tanks are cleaned and await the next printing spurt.
Last year we did two printing spurts... this year I envision 4 - 6 as the demand will dictate.
I did some business with a company that so loved Ciba's and so hated to build contrast masks that they went out and bought a Rhino LVT (higher end neg burner), and a horizontal 10x10 enlarger to produce prrintable negs onto huge sheets of ciba material. I suspect they've graduated to lightjet or lambda by now.